Portable drill



PORTABLE DRILL Filed Feb. lO 1922 rest 7 .Patented @et 9, IQZB.

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JOHN H. BUTIERJBAUGH, 0F JOHNSTOWN, PENNSYLVANIA.

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Application filed February 10, 1922.

T 0 all u1/wm t may concern.:

Be it known that li, JOHN H. BUTERBAUGII, a citizen of the UnitedStates, and resident of Johnstown, in the county of Cambria and State ofPennsylvania, have invented certain new and useful Improvements inPortable Drills, of which the following is a specification.

This invention relates to portable drills and more particularly toguides for portable drills, and has for one of its objects the provisionof a guide for portable drills that will assure the boring of holes atthe predetermined angle to the surface of the material being bored. y

Another object of the invention is to provide means for limiting thelengthwise movement of the drill so as to govern the depth of the holesdrilled.

A further object of the invention is the` provision of a portable drillhaving means for assisting the withdrawal of the drill from the boredholes.

A still further object of the invention is to provide a novel apparatushaving the combination of elements and novel design described *in thefollowing specification and illustrated in the accompanying drawings.

ln the drawings, Figure 1 is a front elevation of a drill constructed inaccordance with my invention.

Figure 2 is a sido elevation thereof.

Figure 3 is a planview ofthe top spreader bar.

Figure 4 is a device.

Referring more particularly to the drawings, the numeral 2 designatesthe motor of the drill, which is of standard design, having a chuck 3adapted to hold drills 4 of various sizes.

rlhe motor 2 is mounted on a guide frame of novel design, comprising twoparallel side lrods 5, which are secured together at their upper ends bya yoke or spreader bar 6, which is rigidly secured to theside rods 5.The lower ends of the rods 5 are pivotally connected to upstanding ears7 on a foot which is provided with a foot engaging ortion 8 on which theoperator may rest is foot to steady the device during operation. rlhefoot rest 7 is also recessed at 9 to provide clearance for thedrill 4.Substantially arcuate brackets/10 are mounted on the base and have slots10a therein through which set screws 10b which are seplan view of thefoot of the backward Serial No. 535,532.

cured in their rods 5 pass freely. The set screws 10b are adapted toengage the brackets 10 to hold the guide frame in various adjustedangular positions.

Y6 are provided with eyes 12 to which the opposite ends of a coil spring13 are secured. 'llhe spring 13 is adapted to become tensioned as thedrill isfed into the work and therefore has a. tendency to move thedrill so as to aid thewithdrawal of the drill from the boredi hole.

` Upper and lower stop collars 14 and 15 are adjustably mounted on eachof the side rods 5 and are. held in position by set screws 16. rTheupper and lower motor guide yokes 11 and 11a are adapted to abut thestop collars 14 and 15, respectively, and thus limit the movement of thedrill on the side rods.

The advantages of this invention will readily be appreciatef. Forinstance, it will bore a hole absolutely at right angles to the face ofthe work, which is very difiicult' to do when holding a portable drillsimply by its two handles, it facilitatesl the work very materially,since it relieves the operator of the weight of the motor, and the coilspring assists in withdrawing the drill from the bored hole.

1. r1`he combination with a motor operated portable drill, of a guidefor said drill, said guide comprising a pair of parallel side rods,upper and lower yokes secured to the upper and lower faces of the motorof said drill and slidably mounted on said Aside rods, a spreader barsecured across the upper ends of said side rods, a coiled spring securedto said spreader bar and to the yoke secured to the upper face of saidmotor, said spring tending to move the motor backward so as to withdrawthe drill from the bored hole, and a base pivotally secured to said sidebars and adapted to be held in engagement with the face of the work bythe foot of the operator, and thus to uide the drill on a determinedline with reference to the face of the work.

2. The combination with a motor operated portable drill, of a guide forsaid drill, said v y said side rods adapted portable drill, of

guide comprising a pair of parallel side rodsupper and lower yokcssecured to the upper and lower faces of the motor of said drill andslidably mounted on said side rods, a spreader bar secured across theupper ends of said side rods, a coiled spring secured to said spreaderbar and to the yoke secured to the upper facey of said motor, saidspring tending to move the motor backward so as to withdraw the drillfrom the bored hole, and stop collars to limit the upward and downwardmovement of said drill.

3. The combination with a motor operated a guide for said drill, saidguide comprising a base member, a pair of adjust-ably secured on,

parallel side rods pivotally mounted on said base members, means forlockingr said side rods in various angular positions relative to saidbase, upper and lower yokes vsecured to the upper and lower Jfaces ofthe motor of said drill and slidably mounted on said side rods, aspreader bar secured across the upper ends of said side rods, and acoiled spring secured to said spreader bar and to the yoke secured tothe upper face of said motor,

said spring ,tending to move the motor backward so as to withdraw thedrill from the bored hole.

In testimony whereof I have hereunto set my hand.

' TOHN H. BUTERBAUGH.

